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Solve the inequality (9-3(x-4)\ge 2(7-x)+x).

Answer and explanation

Correct answer: \(x\le \frac{7}{2}\)

Simplifying the left-hand side gives \(9-3(x-4)=21-3x\), while the right-hand side gives \(2(7-x)+x=14-x\). Thus, \(21-3x\ge14-x\), or \(7\ge2x\). Since 2 is positive, dividing both sides by 2 does not reverse the inequality sign, giving \(x\le\frac{7}{2}\). The option \(x<\frac{7}{2}\) is incorrect because \(x=\frac{7}{2}\) also satisfies the equality case. Exam tip: An inequality sign remains unchanged when dividing by a positive number.

Related tags

Linear InequalitiesOne VariableAlgebraic SimplificationBracket ExpansionClass 11 MathematicsAlgebraic Solution Of Linear Inequalities In One VariableMathematicsClass 11 Mcq

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